Centrifugal mill.



No. 876,765. PATENTED JAN.14, 1908.

H. BESSER. CBNTRIFUGAL MILL.

APPLIOATION FILED OUT. 2. 1906.

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THE NORRIS PETE-RS co., WASHINGTON, n c.

o. 876,765. PATENTED JA1\T.14' 1 I H. BESSER. 908

GEN'TRIPUGAL MILL.

APPLICATION FILED OUT 2 1906 3SHEETS-SHBET 3.

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HERMAN BESSER, OF ALPENA, MICHIGAN.

CENTRIFUGAL MILL.

Specification of Letters Patent.

Patented Jan. 14, 1908.

Application filed October 2. 1906- Serial No. 337,069.

To all whom it may concern:

Be it known that I, HERMAN Bnssnn, a citizen of the United States, and a resident of Alpena, in the county of Alpena and State of Michigan, have invented a new and Improved Centrifugal Mill, of which the following is a full, clear, and exact description.

My inventionrelates to grinding machinery, my more particular object being to produce .a mill in which the movable grinding members are controlled either wholly or in part by the action of centrifugal force, and thus caused to press upon the stationary grimling member or members with a degree of force inherently related to the speed of rotation.

Reference is to be had to the accompanying drawings forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the figures.

Figure 1 is avertical section through a mill, provided with one form of my grinding mechanism, the figure showing the relative disposition of the fixed and stationary grinding member, the annular cup for conveying away the ground material and the revoluble shaft for actuating the movable part; Fig. 2 is a section upon the line 22 of Fig. 1, looking in the direction of the arrow, and showing the arrangement of the weighted grinders 16'relatively to the grinding surfaces 25, 26 of the outer grinding plate; Fig. 3 is a fragmentary section showing another form for the grinding weights and also showing a spring mechanism for partially tensioning these weights independently of centrifugal force; Fig. 4is a fragmentary section showing another form of annularwearing plate provided with a step 35, and against which revolves two sets of weighted grinders 37, 38 disposed at different levels; Fig. 5 is a fragmentary plan view, partly in section, showing the grinding weights as having the form of rollers with rounded edges; Fig. 6 is a fragmentary sec tion on the line 66 of Fig. 5, through one of the rollers and parts adjacent thereto, these rollers having a substantially cylindrical form; Fig. 7 is a side elevation of one of the rollers having cylindrical form, the roller being partly broken away for the purpose of showing the aperture whereby it is pivoted; Fig. 8 is a fragmentary section showing one of the grinding weights as having the form of a stepped roller and the annular wearing plate having proper conformity to be engaged by this roller; and Fig. 9 is a front elevation showing one of the grinding weights having the form of a roller with rounded edges as indicated in Fig. 5.

A frame is provided with ahorizontal beam 6 having an annular bearing 7. A cup bearing 8 is mounted centrally of the frame and supports a revoluble shaft 9. A ulley 10 is rigidly mounted upon this shaft for the purpose of turning the same. Mounted upon the shaft 9 are disks 11, 12 provided respectively with collars 13, 14, the latter being secured rigidly upon the shaft 9 by means of bolts 15. The grinding members 16 are made preferably of metal and are comparatively heavy. These Weighted grinders 16 are pivotally mounted upon pins 17, the latter being provided with reduced threaded portions 18, which extend respectively through the disks 11, 12 and are secured by nuts 19. A supporting ring 20 is mounted rigidly upon the frame 5. Screws 21 encircled by washers 22 are provided for the pur-' pose of engaging this supporting ring. An

annular flange 24 integral therewith, and the inner surface of this wearing plate is provided with comparatively long slopes 25 terminating in comparatively short bevel shoulders 26, as indicated in Fig. 2. The screws 21 pass into threaded apertures 27 of the supporting ring 20. An annular trough is provided with a spout 29 and with an annular flange 20. The latter is secured upon the under side of the supporting ring 20 by means of bolts 31. The washers 22 are removable. This is to allow the stationary plate 23 to be raised or lowered. As the material is ground and passes under the lower edge of this plate the latter gradually wears away and it is desirable to lower the wearing plate 23 from time to time in consequence of this action. Besides it is desirable to adjust the lower edge of the wearing plate relatively to the upper surface of the revoluble disk 11 in order to regulate the fineness of the material discharged into the trough 28. If material of a given degree of fineness is unable to pass between the outer edge of the disk 11 and the lower edge ofthe wearing plate 23 such material is simply retained until ground sufficiently fineto make its eXit.

In the construction shown in Fig. 4. the supporting ring 20 has the shape above described, but the annular wearing plate 32 is of somewhat different conformity. This annular wearing plate 23 is provided with an i wearing plate is provided with an outwardly 1 Each roller is provided with a socket 49 havprojecting flange 33 which is secured by bolts 34 to the supporting ring 20. The wearing plate 32 is provided with a step 35 whereby its grinding surface is bifurcated, and engaging the grinding surface are two weighted grinders 37, 38, each pair of the latter being hinged upon a pin 17 serving the purpose of a spacing bolt and a pivot combined. Any number of steps may be provided, the number of grinding plates corresponding to the number of steps.

The action of the parts just described differs from those shown in Figs. 1 and 2 mainly in the fact that the grinding members 37, 38 act successively upon the material as the latter passes downwardly; in other words, they grind the material more than once. WVhile' I show the slopes 25 and the beveled shoulders 26, I do not limit myself to this particular form of wearing plate.

In the form shown in Fig. 3 the wearing plate 23 has the form shown in Fig. 2 and is similarly mounted upon the supporting ring 20. The sloping surface 25 and the bevel shoulder 26 are arranged as above described. The grinders 16 are pivoted upon the pins 17 and spaced equidistant. Each grinder 16 is provided with a lug 39 comparatively near the pivot and with another lug 40 at the opposite end of the grinder. Each lug 40 car ries a projecting pin 41 which extends through the adjacent lug 39 of the next grinder, the lug last mentioned being perforated for this purpose. A spring 42 encircles each pin 41 and presses in opposite directions the lug 40, one grinder-and the lug 39 of the next succeeding grinder. By this arrangement the tension of the springs 42 always presses the grinding surfaces of the grinders radially outward from the center of location.

Each grinder 16 is provided with a curved surface 43, so arranged that when the grind ers are in motion each. surface 43 coacting with the bevel shoulders 26 serves to gather the material into favorable position for pulverizing, as will be understood from Fig. 2.

While I show the grinders 16, 1.6, 37 and 38 as smooth, it will be understood that I do not limit myself to this particular form as nearly all of the grinders may be roughened in any manner well understood for the purpose of roughening grinding members wherever used in this art.

A housing 44 is used for the purpose of inclosing all of the working parts. A hopper 45 is employed for the purpose of feeding into the mill the material to be ground.

In the form shown in Fig. 5, a number of links 46 are pivotally mounted upon the pins 17 and provided with upwardly projecting bosses 47. Revolubly mounted upon these bosses are rollers which may be of cylindrical form as shown at 48, or which may have rounded edges as shown at 52 in Fig. 9.

ing substantially the same form as the boss 47 as will be understood from Figs. 6 and 7. I sometimes make the roller of the form shown in Fig. 8, in which it consists of two disks 50,51, preferablyintegral. This makes a roller well adapted for the stepped bearing surface above described.

As will be seen from the above, I do not limit myself to any particular conformity of roller, nor to any particular shape of the wearing plate.

My invention is used as follows :The material to be ground being placed in the hopper is allowed to run gradually downward upon the disk 12. Power now being applied to the pulley 10, the shaft 9 causes the rotation of the disks 11, 12 and the parts carried thereby. The weighted grinders are thrown by centrifugal force, the material resting upon the disk 12 is thrown outward by centrifugal-force and gradually works its way into the passage intermediate of the grinders and the inner surface of the wearing ring. The weighted grinders are likewise thrown outwardly by centrifugal force. As they pass around they grind the material against the inner surface of the grinding plate. The long sloping surfaces 25 and the bevel shoulders 26 facilitate this action. It is impossible for any of the material to work toward the shaft 9, for the reason that the centrifugal force keeps it properly distributed. The grinders exert more or less of a pounding action in consequence of the distribution of the sloping of the surfaces 25, 26, as will be understood by Fig. 2.

' Where it is desirable to render the opera- 2 tion comparatively slow and consequently where the centrifugal force is reduced to a minimum the form shown in Fig. 3 may be employed. The action of this form is like that above described with reference to 2 with the exception that the pressure of the springs 42 tends to throw the pins to press the grind ers outwardly, and this tendency is independent of the centrifugal force; that is to say, in the form shown in Fig. 3 the centrifugal force and the elasticity of the springs coact together to force the grinders outwardly.

In the form shown in Fig. 4 the action is the same as above described with the exception that the material is subjected to a plurality of grinding, first by the grinders 37 and next by the grinders 38. The adjustment of the annular wearing plate is alike in all cases.

I do not limit myself to the constructions shown for the reason that slight variations therein may be made without departing from he spirit of my invention.

Where the apparatus shown in Figs. 5 to 9 inclusive is employed, the centrifugal action of the rollers forces them outward against the inner surface of the wearing plates, the ac- By having rollers the friction is greatly lessened.

Having thus described my invention, I claim as new and desire to secure by Letters Patent:

1. The combination of a revoluble memher, a link mounted thereupon and free to swing outward by centrifugal force, a roller mounted upon said link and provided with a stepped surface,- and a grinding plate mounted within the plane'of rotation of said roller and provided with a stepped surface disposed adjacent to the path of said roller.

2. The combination of a wearing ring provided internally with a stepped surface, a revoluble grinding member. provided with a stepped surface mating that of said wearing ring, the diameter of said revoluble wearing member being greater at one end thereof than at the other end in consequence of its stepped surface, and a revoluble disk engaging the end of larger diameter of said revoluble member for the purpose of maintaining said revoluble member in a definite plane relatively to said wearing ring, and means for actuating said revoluble member relatively to said wearing ring.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

HERMAN BESSER.

WVitnesses:

WM H. JOHNSON, C. H. REYNOLDS. 

